forked from OSchip/llvm-project
afd2db5351
Index calculations can use the last value that come out of a loop. Ideally, ScalarEvolution can compute that exit value directly without depending on the loop induction variable, but not in all cases. This changes isAffine to not consider such loop exit values as affine to avoid that SCEVExpander adds uses of the original loop induction variable. This fix is analogous to r262404 that applies to general uses of loop exit values instead of index expressions and loop bouds as in this patch. This reduces the number of LNT test-suite fails with -polly-position=before-vectorizer -polly-unprofitable from 10 to 8. llvm-svn: 262665 |
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| README | ||
README
Polly - Polyhedral optimizations for LLVM ----------------------------------------- http://polly.llvm.org/ Polly uses a mathematical representation, the polyhedral model, to represent and transform loops and other control flow structures. Using an abstract representation it is possible to reason about transformations in a more general way and to use highly optimized linear programming libraries to figure out the optimal loop structure. These transformations can be used to do constant propagation through arrays, remove dead loop iterations, optimize loops for cache locality, optimize arrays, apply advanced automatic parallelization, drive vectorization, or they can be used to do software pipelining.